.copyright
  background-color #3a3a3a
  padding 1.5em 0
  text-align center
  font-size .9em
  span
    color #999
    line-height 1.8em
    margin 0 1em

@media (max-width: 600px) and (min-width: 320px)
  .copyright
    span
      display block
      text-align center